@Jackill, from your conclusive experiment it seems that something goes wrong on inactivity.
Thus it might be interesting to test:
System Preferences > Energy Saver > Power Adapter
and as a bug hunting method, try the different settings which might block any thing which is fired upon inactivity.
dazuelos
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@JacksonSox this is a developers only web server. Some of them are working at Apple,
but this is not an official Apple professionnal grade support web server
. If you want to report a bug, I suggest you to go the official Apple professionnal grade feedback web server:
https://feedbackassistant.apple.com/